This tube is an improvement over the stock E3D HeatBreak. It's made from stainless steel and plated with TwinClad XT coating. TwinClad XT is a very low friction Electroless Nickel composite coating, often used in injection molding because of it release properties. This high lubricity plating will prevent clogging in the critical zone of hotend, where filament liquidizes. It is also very hard and corrosion resistant. Great for high abrasion filaments like Carbon Fiber, Metal filled, Aluminates, etc.